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Perhaps coincidental, perhaps not. I think you are on the right track. Perhaps when the headers were installed they did not remove the spark plugs and bumped one of them and cracked the core. I would definitely replace, or at least swap the spark plug with one from another cylinder and see if the problem moves.
I say coincidence because a failed injector can also cause a cylinder misfire which would have been unrelated to the header install. But I would start with the plug.
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